What percent salinity can grass survive?

Question

what percent of salt (using seawater) can you water grass with before it dies?

Answer 1

St Augustine (Stenotaphrum secundatum) grass is very tolerant right up to but not next to the shore.

http://www.lawngrasses.com/info/graphs.h...

http://www.ctahr.hawaii.edu/sustainag/Co...

Grasses like the Bahia (Paspalum notatum) grasses are  tolerant to some salt exposure in irrigation water.

Bahia salinity tolerance is good up to 4,500 ppm NaCl but 9,000-27,000 ppm NaCl reduces photosynthesis and transpiration but does not kill the grass.

http://www.ctahr.hawaii.edu/sustainag/Co...

http://www.american-lawns.com/grasses/ba...

Zoysia genus is tolerant also up to about 32000 ppm.

http://crop.scijournals.org/cgi/content/...

http://crop.scijournals.org/cgi/content/...

http://www.environmentalturf.com/researc...

Alkali dropseed (Sporobolus airoides) is extremely tolerant up to 600 mM NaCl while Zoysia japonica is injured at 200 mM NaCl.

http://ag.arizona.edu/turf/salinity.html

Bouteloua are the Gramma grass genus that are more sensitive to saline injury than the Zoysia or Bermuda (Cynodon) grasses.

http://ag.arizona.edu/turf/salinity.html

As a percentage 0.1% = 1000 ppm or 1% = 10,000 ppm

Answer 2

That depends on te grass itself.  Check out www.plantstress.com, perhaps it will give you guidance.

Answer 3

It depends on the species of grass, some tolerate grass better than others.  Contact your states agriculture extention agency they would have a list what already works in your area or how to correct any problems in your soil.